package com.wuzf.demo.test01.web.servlet;

import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 将同步改成异步
 * Servlet自带的异步
 */
@WebServlet(urlPatterns = "/my/servlet", asyncSupported = true)
public class MyServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        resp.getWriter().println("Hello World");
        AsyncContext context = req.startAsync();
        context.start(()-> {
            try {
                resp.getWriter().println("Hello World");
            } catch (IOException e) {
                e.printStackTrace();
            }
            context.complete();
        });
    }

}
